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W. H. WARREN. Calipers and Dividers.

No. 228,958. Patented June 15,1880.

- WITNESSES; INVENTOR:

4 w/w BY ATQTQRNEYS.

NFETERS, PNOTO-LITHOGRAPNER, WASHINGTON, o, C.

UNITED STATES PATENT OFFICE.

WILLIAM H. WARREN, OF NEW YORK, N. Y.

CALIPERS AND DIVIDERS.

To all whom it may concern:

Be it known that I, WILLIAM H. WARREN, of the city, county, and State of New York, have invented a new and useful Improvement in Measuring-Instruments, of which the following is a specification.

Figure l is a front elevation of my improvement as applied to a pair of calipers. Fig. 2 is a transverse section on line a m, Fig. 1. Fig. 3 is a transverse section of elevation of a pivoted stud. Fig. at is a transverse sectional elevation of the shoiildered revolving stud.

Similar letters of reference indicate corresponding parts.

This invention relates to measuring-instruments, such as calipers, compasses, dividers and it consists of revolving studs or pivots fixed at any convenient points on the instrument, and in combination with a slotted bar, whereby the legs of the instrument may be adjnsted by means of screw and spring without loosening the clamping screws and nuts.

In the drawings, A A represent legs of a pair of calipers designed for inside measurement, pivoted together in the ordinary manner by a pivot, a.

Pivoted on the upper end of one of the legs is a stud, B, provided with a lateral bore, b, and sockets c 0 in the opposite faces of the stud at each end of the bore 1).

Passing through the upper end of the opposite leg is a pivot, O, on which is firmly fixed a shouldered stud, D, whose shoulder fits into the slot f of the slotted bar E, so that the said bar E can move back and forth on the said stud D and turn with it? The slotted bar E is a little thicker than the shoulder of the stud D, so that when the Washer F is set over the screw-pivot O and the clamping-nut G is screwed as tightly as may be upon it the said slotted bar E is firmly held, so that June 15, 1880.

I it will not slide on the stud '1) when the calipers are adjusted by the nut K.

From one end of the slotted bar E there projects a screw-rod, H, encircling which is a spiral spring, I, and the end of this screw-rod H passes through the bore 1) of the stud B, and has screwed on its end the nut K. The sockets c cin this stud B receive and hold, respectively', an end of the spiral spring and the end of the nut K.

It will be seen that, at whatever angle the legs A A may be separated, the slotted bar E and the screw-rod H maintain their relative positions with the studs B and D, and that without releasing or loosening the clampingnut G the legs of the calipers can be adjusted to any angle by means of the screw-nut K.

Although in the accompanying drawings I have shown my invention as applied to a pair of calipers, it can be applied with equal advantage to other instruments or machinery.

Having thus described myinvention,Iclaim as new and desire to secure by Letters Patcut-- 1. As a means of adjusting the limbs of.

measuring-instruments, the pivoted studs B D, slotted bar E, screw-rod H, spring I, and screwnnts G K, in combination with the limbs A A, substantially as herein shown and described.

2. In a measuring-instrument, the pivoted stud B, constructed with sockets c c and bore b, substantially as herein shown, and for the purpose described.

In a measuring-instrument, the slotted 7 bar E and screw-rod H, constructed substantially as herein shown and described.

WILLIAM H. WARREN.

Witnesses I. l. SToRER, O. SEDGWIGK. 

